Roll-type sandpaper with cutting lines and apparatus for manufacturing cutting lines

ABSTRACT

Disclosed is a roll-type sandpaper, including a base sheet formed of paper or fabric and an abrasive coated to a front surface of the base sheet. Further, the roll-type sandpaper is wound many times, and has a plurality of cutting lines formed in parallel with predetermined intervals and barcodes between the cutting lines on a back surface of the base sheet. Thus, the roll-type sandpaper is advantageous in terms of a small storage volume, and easy cutting by the cutting line even without an additional cutting tool. Moreover, the sandpaper can be purchased in quantities required for abrasion by the barcode, thereby increasing work efficiencies and generating economic benefits. In addition, an apparatus for forming the cutting lines of the sandpaper is provided.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a sandpaper, which comprises a basesheet made of paper or fabric and an abrasive coated to a surface of thebase sheet, and a manufacturing apparatus thereof. More specifically,the present invention is directed to a roll-type sandpaper, which iswound many times, having a plurality of cutting lines, each of which isformed in parallel by a predetermined interval and has a plurality ofslits; and an apparatus for forming the cutting lines of the sandpaper.

2. Description of the Related Art

In general, a sandpaper is a type of an abrading means having anabrasive coated to a surface of a base sheet that is made of paper orfabric, and is utilized to abrade recesses and circular portions, aswell as bulging portions caused by air bubbles upon coloring woods,lacquer wares, furniture, automobiles, etc., or a molding process, or toremove rust from metals.

The abrasive applied for the sandpaper is composed mainly of siliconcarbide, in which silicon carbide is powdered to a predetermined gritsize according to a standard size of the sandpaper, and then adheres tothe base sheet. The higher size number of the sandpaper means that thefinely powdered abrasive having a smaller grit size is coated to thebase sheet of the sandpaper. Thereby, it is possible to perform a fineabrading process.

FIG. 1 shows a conventional sandpaper having a predetermined thickness,which is formed in a quadrangular shape, such as a square. Also, a backsurface of the sandpaper is formed with a printed surface represented bya standard size of the sandpaper and a manufacturer, while the abrasiveis coated on a front surface of the sandpaper.

However, such a sandpaper is disadvantageous in that it is prepared inonly the thin quadrangular shape, thus requiring a large storage volume.Further, the conventional sandpaper is inconvenient to cut by use of anadditional cutting tool, such as scissors or a blade, depending on enduses or using ranges thereof. In such cases, the cutting tool in use maybe damaged, due to the rough grit and high hardness of the sandpaper.Moreover, since the conventional sandpaper is sold by thin quadrangularshapes, it should be purchased in a costly large quantity, thus negatingeconomic benefits. Otherwise, when the sandpaper is sold by the length,it additionally measures the length thereof and is cut according to themeasured length, which is involved. Furthermore, it is expensive to buythe sandpaper as a fixed price.

SUMMARY OF THE INVENTION

Therefore, it is an object of the present invention to alleviate theproblems encountered in the related art and to provide a roll-typesandpaper having cutting lines, which is advantageous in terms of asmall storage volume, easy cutting by the cutting line even without anadditional cutting tool, and purchase in quantities required forabrasion by a barcode provided between the cutting lines, thus improvingwork efficiencies and generating economic benefits.

Another object of the present invention is to provide an apparatus formanufacturing the cutting lines of the sandpaper.

To achieve the above objects, there is provided a roll-type sandpaperaccording to a first embodiment of the present invention, characterizedin that the sandpaper is wound many times, and has a plurality ofcutting lines, each of which is formed in parallel with a predeterminedinterval and has a plurality of slits. Further, the above sandpapercomprises respective barcodes between the cutting lines on a backsurface thereof and a V-shaped cut formed to at least one end of eachcutting line.

In addition, according to a second embodiment of the present invention,there is provided a roll-type sandpaper, characterized by comprising anabrading surface having an abrasive coated to a middle portion spacedfrom both side ends of a front surface of the base sheet in alongitudinal direction thereof, and a non-abrading surface formed atboth sides of the abrading surface and not coated with the abrasive.Also, the above sandpaper has at least one both-sided adhesive attachedon a back surface thereof, corresponding to the position of thenon-abrading surface formed to the front surface thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a perspective view of a conventional sandpaper;

FIG. 2 is a perspective view of a sandpaper, according to a firstembodiment of the present invention;

FIG. 3 is a perspective view of a sandpaper, according to a secondembodiment-of the present invention;

FIG. 4 is a perspective view showing the sandpaper in use, according tothe first embodiment of the present invention;

FIG. 5 is a perspective view showing the sandpaper in use, according tothe second embodiment of the present invention; and

FIG. 6 is a perspective view of an apparatus for forming cutting linesof the sandpaper of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference should now be made to the drawings, in which the samereference numerals are used throughout the different drawings todesignate the same or similar components.

FIG. 2 is a perspective view of a roll-type sandpaper, which has cuttinglines 10, barcodes 11 and V-shaped cuts 12, according to a firstembodiment of the present invention.

As shown in FIG. 2, the sandpaper that is rolled comprises a base sheetmade of paper or fabric, in which an abrasive is coated on a frontsurface 13 of the base sheet, and a plurality of cutting lines areformed in parallel by predetermined intervals on a back surface 14 ofthe base sheet. Further, the cutting line 10 of the sandpaper has aplurality of slits, and thus, is in the temporarily cut state. Hence,the sandpaper can be easily cut along the respective cutting lines 10even without an additional cutting tool. In such a case, the intervalsbetween the cutting lines 10 may vary, for example, 10, 40, 50 cm and 1m, depending on end uses or shapes of the sandpaper. Alternatively,instead of the cutting lines 10 each having the plurality of the slits,a plurality of grooves, serving as a temporary cutting line, may beformed in the front surface 13 of the base sheet.

Moreover, the roll-type sandpaper is preferably labeled with thebarcodes 11, each of which has a unique pattern between the cuttinglines on the back surface 14 of the base sheet thereof by use of abarcode printer. Since each barcode 11 is provided between the cuttinglines 10, the sandpaper may be sold in a piece unit or more by a barcodesensor, according to the end uses or using ranges thereof.

Furthermore, it is preferred that the roll-type sandpaper has theV-shaped cuts 12 formed to one or more ends of the respective cuttinglines 10. By the V-shaped cut 12, the sandpaper can be easily cut. Inaddition, when the V-shaped cuts 12 are provided to opposite ends of therespective cutting lines 10, the sandpaper can be more easily cut,regardless of a cutting direction. Also, the number of the V-shaped cuts12 can be counted even in the state of the sandpaper being wound, andthus, it is possible to confirm the entire length of the sandpaper. Forinstance, if the intervals between the cutting lines 10 are 1 m and thenumber of the V-shaped cuts 12 on any one side of the base sheet is ten,the entire length of the sandpaper is 10 m.

The roll-type sandpaper with the cutting lines may be cut along eachcutting line 10. Additionally, the roll-type sandpaper shown in FIG. 4has an insert hole 20 at a center thereof, and hence, becomes convenientfor storage and cutting in use by fitting a holder 21 into the inserthole 20 of the sandpaper.

FIG. 3 is a perspective view of a roll-type sandpaper, having anabrading surface 13 a, a non-abrading surface 13 b, cutting lines 10,barcodes 11, V-shaped cuts 12 and double-sided adhesives 15, accordingto a second embodiment of the present invention.

As shown in FIG. 3, the roll-type sandpaper, according to the secondembodiment, is characterized in that the abrasive is not coated on theentire front surface of the base sheet. That is, the abrasive is coatedto only a middle portion which is spaced from both side ends of thefront surface 13 of the base sheet along a longitudinal direction of thebase sheet, to form the abrading surface 13 a. Thereby, the non-abradingsurface 13 b, which is not coated with the abrasive, is provided at bothsides of the abrading surface 13 a. In this case, the abrading surface13 a and the non-abrading surface 13 b may have various widths,depending on the end uses or using ranges of the sandpaper. Like this,the reason why the abrading surface 13 a and the non-abrading surface 13b are separately provided to the sandpaper is that user's injuriescaused by directly gripping typical sandpaper with user's hands upon anabrading process can be prevented. Additionally, the above surfaces 13 aand 13 b allows the sandpaper to be fastened to an assistant holdingtool 22 which serves to increase work efficiencies. In this regard, theback surface 14 opposite the abrading surface 13 a of the base sheet isplaced under a lower surface of the assistant holding tool 22, and theback surface 14 opposite the non-abrading surface 13 b of the base sheetis placed to be in contact with both sides or upper surface of theassistant holding tool 22. Moreover, since the abrasive is coated toonly the abrading surface 13 a of the base sheet required for theabrasion, it may be used in smaller amounts. Further, both the abradingsurface 13 a and the non-abrading surface 13 b may have bendable lines,and thus, be easily bent along both lower edges of the assistant holdingtool 22 and combined therewith.

As shown in FIG. 5, the roll-type sandpaper further comprises at leastone both-sided adhesive 15, which is attached to the back surface 14 ofthe base sheet, corresponding to the position of the non-abradingsurface 13 b formed to the front surface of the base sheet.

Therefore, the lower surface of the assistant holding tool 22 comes intocontact with the -back surface 14 opposite the abrading surface 13 a ofthe base sheet, and both sides or upper surface thereof come intocontact with the back surface 14 opposite the non-abrading surface 13 bthereof. Thereby, the sandpaper is combined with the assistant holdingtool 22 by means of the both-sided adhesive 15 attached to the backsurface 14 thereof. Hence, the back surface 14 of the base sheet isprevented from sliding from the assistant holding tool 22, resulting inimproving the work efficiencies. Meanwhile, the sandpaper of the presentinvention may be loosened by its own resilience in the state of beingwound in a roll shape. Therefore, with the aim of the sandpaper beingtightly wound, the non-abrading surface 13 b of the base sheet and theback surface 14 of the base sheet, which face each other in the state ofthe sandpaper being wound, are bonded together by means of theboth-sided adhesive 15.

The roll-type sandpaper, according to the second embodiment of thepresent invention, has the cutting lines 10, the barcodes 11, and theV-shaped cuts 12, as in the first embodiment of the present invention.

Below, a description will be given of an apparatus for forming cuttinglines of a sandpaper of the present invention.

As shown in FIG. 6, the apparatus is composed of a first roller 40equipped with a steel blade 42, and a second roller 41 positioned abovethe first roller 40, in which a sandpaper strip 30 having a base sheetmade of paper or fabric and an abrasive coated to a front surface of thebase sheet is transferred in the direction of an arrow between the firstand second rollers 40 and 41 connected to a frame.

The steel blade 42 is used to form the cutting lines 10, and is fittedinto a long groove formed in a longitudinal direction of the firstroller 40. Thus, the intervals between the cutting lines 10 aredetermined by a circumferential length of the first roller 40. That is,the circumferential length of the first roller 40 is changed to adjustthe intervals between the cutting lines 10. Further, a plurality of longgrooves may be formed at regular intervals on the outer surface of thefirst roller 40, into which a plurality of steel blades 42 are fitted tocontrol the intervals between the cutting lines 10. For example, if thecircumferential length of the first roller 40 is 1 m and two steelblades 42 are fitted into the first roller 40, the intervals between thecutting lines 10 are 50 cm long.

Further, the steel blade 42 is preferably shaped in a saw tooth capableof forming a plurality of slits. Alternatively, another steel blade (notshown) without a saw tooth is used, instead of the saw-toothed steelblade 42, and thus, it is possible to form grooves in the sandpaperstrip 30 to provide a temporary cutting line.

The second roller 41 comprises a surface made of an elastic material,and hence, functions to apply pressure to the first roller 40 so as toform the plurality of slits by means of the steel blade 42 of the firstroller 40. Further, the second roller 41 has a buffering function. Theelastic material used for the second roller 41 is exemplified by arubber-based material.

As for operation of the above apparatus, when the sandpaper strip 30 istransferred between the first roller 40 and the second roller 41, thefirst roller 40 is rotated by a motor to be the same as a transferringdirection and a transferring rate of the sandpaper strip 30 while beingin contact with the back surface 14 of the base sheet of the sandpaperstrip 30. In this case, while the second roller 41 is rotated in areverse direction to a rotating direction of the first roller 40, itpressurizes the steel blade 42 of the first roller 40. Thereby,equally-spaced cutting lines 10 are formed on the sandpaper strip 30 bythe first roller 40 which is rotated at a constant rate, in which eachcutting line has the plurality of the slits formed by the steel blade 42of the first roller 40.

The sandpaper strip 30 having the cutting lines 10, manufactured by useof the above apparatus, is produced in various standard sizes by cuttingit at a predetermined width by an additional cutting device, and iswound in a roll by means of an additional roller, thus obtaining a finalsandpaper with cutting lines. Further, the V-shaped cut 12 is formed toat least one end of the respective cutting lines of the sandpaper bymeans of an additional V-shaped cut cutter.

Before or after the cutting lines 10 are formed, the barcode 11 havinginformation, such as a standard size of the sandpaper and a price ofeach piece thereof, is formed on the back surface 14 of the base sheetby use of a barcode printer.

As described hereinbefore, the present invention provides a roll-typesandpaper with cutting lines, and an apparatus for forming the cuttinglines of the sandpaper. Such a roll-type sandpaper is advantageous interms of a small storage volume, and easy cutting by the cutting lineeven without an additional cutting tool. Further, a barcode is providedbetween the cutting lines of the sandpaper, and thus, the sandpaper canbe purchased in quantities required for abrasion, thereby increasingwork efficiencies and generating economic benefits.

Although the preferred embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims.

1. A roll-type sandpaper, comprising a base sheet formed of paper orfabric and an abrasive coated to a front surface of the base sheet,wherein the sandpaper is wound many times, and has a plurality ofcutting lines, each of which is formed in parallel by a predeterminedinterval and has a plurality of slits.
 2. The sandpaper as defined inclaim 1, wherein the abrasive is coated to a middle portion spaced fromboth side ends of the front surface of the base sheet in a longitudinaldirection of the base sheet, thereby providing a non-abrading surface,which is formed at both sides of the middle portion of the base sheetand is not coated with the abrasive.
 3. The sandpaper as defined inclaim 1, further comprising a barcode provided between the cutting lineson a back surface of the base sheet.
 4. The sandpaper as defined inclaim 2, further comprising a barcode provided between the cutting lineson a back surface of the base sheet.
 5. The sandpaper as defined inclaim 1, further comprising a V-shaped cut formed to at least one end ofthe respective cutting lines.
 6. The sandpaper as defined in claim 2,further comprising a V-shaped cut formed to at least one end of therespective cutting lines.
 7. The sandpaper as defined in claim 2,further comprising at least one both-sided adhesive provided on the backsurface of the base sheet, corresponding to the position of thenon-abrading surface formed to the front surface of the base sheet. 8.An apparatus for manufacturing cutting lines of a sandpaper, comprising:a first roller equipped with at least one steel blade, and a secondroller positioned above the first roller and having a surface made of anelastic material, wherein equally-spaced cutting lines are formed to asandpaper strip transferring between the first roller and the secondroller by rotation of the first roller.
 9. The apparatus as defined inclaim 8, wherein the steel blade is saw toothed.